A hypothetical electrochemical cell is shown below: <br> $ \overset{\Theta}{A} | A^+ (xM)|| B^+ (yM)| \overset{\bigoplus}{B}$ <br> The emf measured is +0.20V. The cell reaction is:

Question

( A ) $A^{+}+e^{-}\to A;B^{+}+e^{-}\to B$
( B ) $A^{+}B\to A+B^{+}$
( C ) $A+B^{+}\to A^{+}+B$
( D ) The cell reaction cannot be predicted